Reinforced monolithic conduit.



PATENTED AUG. 25, 1908. J. M. BOYLE.

REINFORGED MONOLITHIC CONDUIT.

APPLICATION FILED FEB. 20, 1907.

2 SHEETS-SHEET l.

m.\ www..

om z 0 m 9 l LA Il S Il Mnv N Il l *V41 G. E I U n. 1.1 A M D E T m W.. T U A D D.. N 7. C l w w E H um L T n Y T.. 0 L m B O L N H 0 M M w A R P 0 P D.. A N I E R Mw @f n\.. l W N N a m O. N N w n W INVENTOR JWM @y BYQ ATTORNEY UNITED sTATEs PATENT oEEIcE.

JAMES M. BOYLE, OFUNEW YORK, N. Y., ASSIGNOR TO MONOLITHIO CORPORATION OFNEW YORK. J.

DUCT COMPANY, Av

REINFORCED MONOLTHIC CONDUIT.

Specification of Letters Patent. u

Patented Aug..25,1,9os.

Application led February 20, 1907. Serial No. 358,423;`

' specification.

The invention relates to monolithic conduits constructed of plastic cement capable of hardening on setting. The invention consists' in such a conduit provided with reinforcing bodies embedded in its wall which bodies are alsa electrical conductors and are connected in electrical` circuits for any desired purpose, such as the conveyance of current, or, as more particularly hereinafter described, the protection of the sheath of a cable inclosed in said conduit from electro-chemical attack.

In the accompanying drawingsFigure 1 is a vertical longitudinal section, of a conduit embodying myinvention showing a reinforcing body connected inv electrical circuit. Fig. 2 is a horizontal longitudinal section of a similar conduit showing the mutually insulated reinforcing bodies connected in separate circuits. Fig. 3 is a longitudinal section of a conduit embodying myv invention, wherein the reinforcing bodies are connected to cable sheath and ground, said section being on the line :t of Fig. 4. Fig. 4 is a cross section'on the line y. y. of Fig. 3. Fig. 5 is a perspective view showing 'the arrangement and connections of reinforcing bodies, cable sheath andground. Fig. 6 is a vertical longitudinal section of a conduit showing the continuity of the reinforcing bodies from sec-4 tion to section.

Similar numbers of reference indicate like parts.

1 is the conduit preferably made by molding cement or other material capable of hardening upon setting upon a distended iieXible core, substantially in the manner set forth in U. S. Letters Patent No. 830,204, granted to me September 6th,v 1906. Into the bore of the conduit may be drawnA the electrically conducting cable 2, inclosed as usual in a sheath 3 of metal. In the wall of the conduit are embedded elongated bodies of reinforcing material, Which is also )electrically conductive. In the embodiment of my invention 'shown in the drawings, the said bodies are Hat rods or bars 4, disposed in two groups A, B, respectively on opposite sides of the conduit bore. The material of said reinforcing bodies is to.l be metal of such and augment the strength -of the conduit tube. Forelectrical purposes the saidvreintors.' Thus as indicated in Fig.y 1, the rein,

strength and proportions aswill reinforce` l f forcing bodies maybe utilized as line conducl forcing body 4 is connectedin electrical cir` cuit by means of the connecting wires'p5, binding posts 6 on the outside of the condult and the source of current 7. In Fig. 2,. the

three reinforcing bodies 4 vare each in like j manner connected separately in electrical circuit and are mutually insulated by the material of the conduit.

The interior of the conduit may notonly ,Y

be employed to hold an electrical cable'or conductor, but for any other desi-red pur-` i pose; as for exam le, to convey water, gas `or oil, or to receive e ectrically or pneumatically z` In Fig. 1- the interior of the conduit is indicated 'as conveyin a liquid, such igorcing bar 4 is v.

driven cars.

as -oil or water, and the rein part of an electrical circuit.

pipe constitutes a collector of stray ground currentswhichat the most advantageous points within each section are eitherpassed into or taken from -the cable sheath through the cement, which is usually more 'or less damp. The resulting electro-chemicalre-4 actions are often disastrous to thevsheath.

In my invention the reinforcing bodies are A electrically continuous from` endto end of the conduit and may be arranged to prevent the foregoing difficulty. Thus in Fig. 5, the bars 4 of the groups -A and B areelectrically connected by thel cross bars' 5a and there in turn are connected by Wires 6, to one another, to the cable sheath and to round, thus bringing all to the same potentiaA andeffectually protecting the cable sheath. In the arrangement shown in Figs. 3 and 4,` the bars 4 are bonded by cross wires or bars. 7 a to form a` net work, which is electrically connected to the --cable sheath and to ground at thelends and .which may be connected to ground or other'. points 801,4 In Figs. 3- to 5 inclusive is illustrateda@ of loW potential/'at any desired number of i -in each section in turn as the sections are successively made. Thus it is rst laid and embedded in the first section (10, Fi 6) and When that section is completed anot er part of the same body is embedded in the neX-t section 11I and so on continuously from end to end of the entire conduit.

The term reinforcing material used in the claims means any material which when embedded in the cement increases the stren th of the mass. The term cement inclu es broadly any material which hardens by setting from a plastic state.

I claim 1. A continuous monolithic conduit Wholly formed of plastic material capable of hardening and molded in its permanent location, having embedded in its material and throughout its length a continuous longitudinal strip of electrically conducting reinforcing material and means for connecting said strip in electrical circuit.

2. A continuous monolithic conduit Wholly formed of plastic material capable of hardening and molded in its permanent location, having embedded in its material an electrically conducting cable provided with a metallic sheath and outside of said cable a plurality of continuous longitudinal strips of electrically conducting material and means for electrically connecting said cable sheath and strips to ground.

In testimony whereof l have affixed my signature in presence of two Witnesses.

JAMES M. BOYLE. Witnesses:

WM. H. SIEGMAN, GERTRUDE T. PORTER. 

